When something causes your manhood to recoil into its shell like a frightened turtle, you are said to have IKP.

Causes of IKP include, but are not limited to:

- being pantsed in public
- getting caught by a parent while doing explicit things with your girlfriend
- getting slapped/kicked/tapped in the testicles (see balltap)
- having to dance with the DUFF of a group
- stepping in the shower when there is no hot water

Dude, when my girlfriend's dad caught us having sex, I went total IKP.

When Jake got pantsed in front of his entire gym class, he got IKP like crazy.